The aim of this study is to assess the influence of kind of allergic disease, allergic profile, allergen exposure, treatment method on lung function parameters, fractional exhaled nitric oxide level in children suspected and being diagnosed due to allergic diseases.

Evaluation of the Relationship Between the Parameters of Pulmonary Function (PF) and the Concentration of Fractional Exhaled Nitric Oxide (FeNO) and Clinical Characteristics in Children Being Diagnosed Due to Suspicion of Allergic Diseases

Allergic disease diagnosis. The diagnosis and the severity of asthma, allergic rhinitis and atopic dermatitis and other allergic diseases universally established by the doctors (allergologists) according to standard definitions of diseases in the latest guidelines

The aim of this study is to assess the influence of kind of allergic disease, allergic profile, allergen exposure, treatment method on lung function parameters, fractional exhaled nitric oxide (FeNO) level in children suspected and being diagnosed due to allergic diseases.

Study will be retrospective, conducted in all children diagnosed in the years of 2005-20012 in Laboratory of lung function tests of Department of Pediatrics and Allergy, Medical University of Lodz, N. Copernicus Hospital, Lodz, Poland. The investigators will analyse 5500 male an female children 5-18 year old suspected and being diagnosed due to allergic diseases. In these children nearly 3000 FeNO measurements, 65000 spirometry measurements, 22000 whole-body plethysmography measurements and 48000 occlusion resistance measurements were performed between the years of 2005-2012.

The investigators will retrospectively evaluate following data from medical documentation of patients:

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Please refer to this study by its ClinicalTrials.gov identifier: NCT01805635